zxld1362 Zetex Semiconductors plc., zxld1362 Datasheet - Page 3

• Manufacturer Part Number: zxld1362
• Description: 1a Led Driver With Internal Switch
• Manufacturer: Zetex Semiconductors plc.

Electrical characteristics
(*) Ratio of maximum brightness to minimum brightness before shutdown V
(†) Parameters are not tested at production. Parameters are guaranteed by design, characterization and process control.
Issue 1 - December 2007
© Zetex Semiconductors plc 2007
NOTES:
Symbol
V
R
I
R
I
D
DC
T
f
T
T
T
f
D
LXmean
LX(leak)
LX
LXmax
PWmin_REC
ADJon
SS
ONmin
OFFmin
ADJ
LX
PWM(LF)
LX
ratio 10:1.
ADJ
(*)
Parameter
DC voltage on ADJ pin to switch
device from quiescent (off) state
to active (on) state
Resistance between ADJ pin
and V
Continuous LX switch current
LX Switch ‘On’ resistance
LX switch leakage current
Duty cycle range of PWM signal
applied to ADJ pin during low
frequency PWM dimming mode
Brightness control range
DC Brightness control range
Soft start time
Operating frequency
(See graphs for more detail)
Minimum switch ‘ON’ time
Minimum switch ‘OFF’ time
Recommended minimum switch
pulse width
Recommended maximum
operating frequency
Recommended duty cycle range
of output switch at f
REF
(test conditions: V
LXmax
Conditions
V
0< V
V
@ I
PWM frequency
<300Hz
PWM amplitude = V
Measured on ADJ pin
See note
Time taken for output
current to reach 90% of
final value after voltage
on ADJ pin has risen
above 0.3V
Requires external
capacitor 22nF. See
graphs for more details
ADJ pin floating
L = 68 H (0.1 )
I
Driving 3 LEDs
LX switch ‘ON’
LX switch ‘OFF’
LX switch 'ON' or ‘OFF’
OUT
IN
ADJ
ADJ
3
=24V, T
LX
ADJ
= 1A @ V
rising
> V
= 1 A
< V
REF
(*)
amb
REF
+100mV
LED
=25°C unless otherwise stated)
REF
= 3.6V
= 1.25/0.3. V
REF
0.001
Min.
10.4
0.2
0.3
30
REF
130
externally driven to 2.5V,
1000:1
70
Typ.
0.25
14.2
300
800
ZXLD1362
0.5
5:1
50
2
www.zetex.com
(†)
(†)
Max. Unit
500
0.3
1.0
0.7
65
18
1
5
1
(
cont.)
KHz
kHz
ms
k
k
ns
ns
ns
A
V
A